• Archives of Reconstructive Microsurgery
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• 제2권1호
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• pp.77-81
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• 1993

Free tissue transplantation is commonly performed with the brilliant achievement in microsurgery and anticoagulants and antithrombotic agents have been prescribed in the procedures. However, there is no clean-cut indication as to which agents would be more effective in every steps and final consequences. Low molecular weight heparins inhibiting coagulation in plateletrich plasma and acting on the vascular endothelium have antithrombotic and fibrinolysis action. The experiment with rat groin free flap transplantation after 6-hour ischemia and injection of the low molecular weight heparin was performed and the results between the injection and non-injection group were analysed as follows, 1. Both of the 24-hour groups, vessel patency was not proportional to color change of the groin flap. 2. On the second day after anastomois, heparin-injection group showed intact intima, patent lumen without thrombus, and mild granulomatous inflammation around the suture material and control group with doubtful patency revealed intimal loss and thrombus formation. 3. On the 5th, 7th, and 9th postoperative day, heparin group was patent in anastomosis and showed acute inflammatory cells. 4. The 7th-week period, heparin-injection group showed intact flap color, patent lumen with intact intima and persistent foreign body granuloma.

• 대한구순구개열학회지
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• 제14권1_2호
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• pp.45-56
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• 2011

Face transplantation has been reported over the last six years, and it started in 2004 with the announcement of Cleveland Clinic granting the world's first IRB approval to proceed with human face transplantation. Composite tissue allografts (CTAs) in the facial region are considered to be more immunogenic than other solid organ transplants, so these kinds of animal experiments were also considered as challengeable activities to the facial reconstructive surgeons. For the better understanding of CTAs in the oral and maxillofacial fields, we reviewed several recent articles about facial composite transplantation animal model, and summarized some knowledges of composite midface allotransplantation model with sensory and motor reinnervation in this review article.

• Archives of Plastic Surgery
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• 제50권4호
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• pp.415-421
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• 2023

The revision of the Korea Organ Transplantation Act (KOTA) in 2018 included hand/arm among the organs that can be transplanted. The first hand transplantation since the revision of KOTA took place in January 2021. A 62-year-old male patient experienced hand amputation on July 13, 2018, by a catapult injury. The patient first visited our institute 3 months after the injury. After serial interviews and an overall evaluation, the patient was registered on the hand transplantation waiting list in January 2020. On January 9, 2021, the patient underwent hand transplantation at the right distal forearm level. The total operation time was 17 hours 15 minutes, and the cold ischemic time was 4 hours 9 minutes. Postoperative immunosuppression was administered based on the protocol used for kidney transplantation. Two acute rejection episodes occurred, on postoperative days 33 and 41. Both rejection episodes were reversible with rescue therapy of a higher tacrolimus trough level, steroid pulse therapy, and topical immunosuppressants. Controlled passive range of motion exercise was started on postoperative day 10. Dynamic splint was applied on postoperative day 18. At 1 year, graft maintenance and functional improvement were satisfactory, and the patient showed a Disabilities of Arm, Shoulder and Hand score of 25.8. We successfully performed the first hand transplantation surgery under the KOTA amendment. It came from the organic and effective cooperation of plastic, orthopaedic, and transplantation departments and we believe it will guarantee the future ongoing success.

• Bulletin of the Korean Chemical Society
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• 제33권6호
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• pp.1983-1988
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• 2012

Stem cell transplantation is emerging as a possible new treatment for liver cirrhosis, and recent animal studies have documented the benefits of stem cell therapy in a hepatic fibrosis model. However, the underlying mechanism of stem cell therapy is still unclear. Among the proposed mechanisms, the cell replacement mechanism is the oldest and most important, in which permanently damaged tissue can be replaced by normal tissue to restore function. In the present study, Cy5.5-labeled superparamagnetic iron oxide (SPIO) was used to label human mesenchymal stem cells. The uptake of fluorescently labeled nanoparticles enabled the detection and monitoring of the transplanted stem cells; therefore, we confirmed the direct incorporation and differentiation of SPIO into the hepatocyte-like transplanted stem cells by detecting human tyrosine aminotransferase (TAT), well-known enzymatic marker for hepatocyte-specific differentiation.

• Macromolecular Research
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• 제13권4호
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• pp.277-284
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• 2005

The loss or failure of an organ or tissue can occur because of accident or disease, for which tissue or organ transplantation is a generally accepted treatment. However, this approach is extremely limited due to donor shortage. Tissue engineering is a new and exciting strategy, in which patients who need a new organ or tissue are supplied with a synthetic organ or tissue. In this approach, tissues are engineered using a combination of the patient's own cells and a polymer scaffold. The polymer scaffold potentially mimics many roles of extracellular matrices in the body. Various polymers have been studied and utilized to date in tissue engineering approaches. However, no single polymer has been considered ideal for all types of tissues and approaches. This paper discusses the design parameters of those polymers potentially useful in tissue regeneration.

• Journal of Periodontal and Implant Science
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• 제43권6호
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• pp.315-322
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• 2013

Purpose: In this study, we investigated the effect of silk scaffolds on one-wall periodontal intrabony defects. We conjugated nano-hydroxyapatite (nHA) onto a silk scaffold and then seeded periodontal ligament cells (PDLCs) or dental pulp cells (DPCs) onto the scaffold. Methods: Five dogs were used in this study. Bilateral 4 mm${\times}$2 mm (depth${\times}$mesiodistal width), one-wall intrabony periodontal defects were surgically created on the distal side of the mandibular second premolar and the mesial side of the mandibular fourth premolar. In each dog, four of the defects were separately and randomly assigned to the following groups: the PDLCcultured scaffold transplantation group (PDLC group), the DPC-cultured scaffold transplantation group (DPC group), the normal saline-soaked scaffold transplantation group, and the control group. The animals were euthanized following an 8-week healing interval for clinical, scanning electron microscopy (SEM), and histologic evaluations. Results: There was no sign of inflammation or other clinical signs of postoperative complications. The examination of cellseeded constructs by SEM provided visual confirmation of the favorable characteristics of nHA-coated silk scaffolds for tissue engineering. The scaffolds exhibited a firm connective porous structure in cross section, and after PDLCs and DPCs were seeded onto the scaffolds and cultured for 3 weeks, the attachment of well-spread cells and the formation of extracellular matrix (ECM) were observed. The histologic analysis revealed that a well-maintained grafted volume was present at all experimental sites for 8 weeks. Small amounts of inflammatory cells were seen within the scaffolds. The PDLC and DPC groups did not have remarkably different histologic appearances. Conclusions: These observations indicate that nHA-coated silk scaffolds can be considered to be potentially useful biomaterials for periodontal regeneration.

• Journal of Microbiology and Biotechnology
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• 제15권1호
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• pp.105-111
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• 2005

End-stage renal disease is a fatal and devastating disease that is caused by progressive and irreversible loss of functioning nephrons in the kidney. Dialysis and renal transplantation are the common treatments at present, but these treatments have severe limitations. The present study investigated the possibility of reconstructing renal tissues by transplantation of renal precursor cells to replace the current treatments for end-stage renal disease. Embryonic renal precursor cells, freshly isolated from metanephroi of rat fetus at day 15 post-gestation, were seeded on biodegradable polymer scaffolds and transplanted into peritoneal cavities of athymic mice for three weeks. Histologic sections stained with hematoxylin & eosin and periodic acid-Schiff revealed the formation of primitive glomeruli, tubules, and blood vessels, suggesting the potential of embryonic renal precursor cells to reconstitute renal tissues. Immunohistochemical staining for proliferating cell nuclear antigen, a marker of proliferating cells, showed intensive nuclear expression in the regenerated renal structures, suggesting renal tissue reconstitution by transplanted embryonic renal precursor cells. This study demonstrates the reconstitution of renal tissue in vivo by transplanting renal precursor cells with biodegradable polymer scaffolds, which could be utilized as a new method for partial or full restoration of renal structure and function in the treatment of end-stage renal disease.

• The Journal of Korean Physical Therapy
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• 제22권1호
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• pp.67-73
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• 2010

Purpose: We tested whether repetitive transcranial magnetic stimulation (rTMS) improved recovery following spinal cord injury (SCI) in rats with transplantation of adipose tissue-derived stromal cells (ATSCs). Methods: Twenty Sprague-Dawley rats (200-250 g, female) were used. Moderate spinal cord injury was induced at the T9 level by a New York University (NYU) impactor. The rat ATSCs (approximately $5{\times}10^5$ cells) were injected into the perilesional area at 9 days after SCI. Starting four days after transplantation, rTMS (25 Hz, 0.1 Tesla, pulse width=$370{\mu}s$, on/off time=3 sec/3 sec) was applied daily for 7 weeks. Functional recovery was assessed using the Basso, Beattie, and Bresnahan (BBB) locomotor rating scale as well as pain responses for thermal and cold stimuli. Results: Both groups showed similar, gradual improvement of locomotor function. rTMS stimulation decreased thermal and cold hyperalgesia after 7 weeks, but sham stimulation did not. Conclusion: rTMS after transplantation of ATSCs in an SCI model may reduce thermal hyperalgesia and cold allodynia, and may be an adjuvant therapeutic tool for pain control after stem cell therapy in SCI.

• Journal of Chest Surgery
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• 제35권5호
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• pp.336-342
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• 2002

배경: 최근 들어 심부전증을 가진 심장에 세포이식을 이용하여 심장기능을 개선시키고자 하는 연구가 활발히 진행되고 있다. 이 연구는 확장성 심근증을 가진 햄스터 심장에 배양한 평활근 세포와 심근세포를 이식한 후 심장기능의 변화를 관찰하였다. 대상 및 방법: 심근세포와 평활근세포는 BIO 53.58 햄스터의 심장과 옃션 deferens에서 분리하여 배양하였다. 실험군은 각각 10마리로서 심근세포 (1군)와 평활근세포 (2군) 및 배양액 (3군)을 17주된 BIO 53.58 햄스터의 좌심실에 이식하였고 Cyclosporine (5mg/Kg)을 1군에 한하여 수술 직후부터 매일 피하주사하였다. sham군 (4군) 은 세포나 배양액의 이식 없이 단순 흉부수술만을 시행하였다. 세포나 배양액의 이식 4주 후에 Langendorff 체외순환 모델을 이용하여 좌심실기능을 측정하였다. 결과: 조직학적 검사상 모든 군에서 심한 심근괴사가 있었고, 1군과 2군에서는 수여심장의 심근 내에서 새로운 근육조직이 형성되었다. 좌심실기능의 평가에서 1군과 2군은 3군과 4군에 비해 통계적으로 유의하게 우수하였고 (p<0.01), 2군은 1군에 비해 수축기 좌심실압과 발생기압이 통계적으로 유의하게 우수하였다 (p<0.05). 그러나 3군과 4군 사이에는 통계적인 유의성이 없었다. 절론 확장성 심근증을 가진 햄스터 심장에 배양한 평활근 세포와 심근세포를 이식한 결과 수여심장의 심근 내에서 근육조직을 형성하고 좌심실기능을 개선시켰으며, 이 중 평활근세포를 이식한 심장이 수축기 좌심실압과 발생기압이 더 우수한 좌심실기능 개선효과를 보여주었다.

• Archives of Reconstructive Microsurgery
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• 제8권2호
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• pp.176-183
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• 1999

전북대학교병원 정형외과에서 1993년 12월부터 1998년 9월까지 하지의 만성 골수염 7례에 대하여 유리 근 피판 이식술을 시행하고 최소 1년 2개월부터 최장 5년 3개월까지 추시하여 다음과 같은 임상적 결과를 얻었다. 1. 만성 골수염의 발생 부위는 경골이 4례, 종골 2례 그리고 대퇴골이 1례였다. 2. 만성 골수염의 지속 기간은 평균 31.6년이었다. 3. 전체 7례 중 1례에서 편평 상피암이 발병되었다. 4. 만성 골수염은 4례에서 혈행성 감염으로 초래되었고, 3례는 외상력이 있었는데 2례는 교통사고 그리고 1례는 경미한 외상이었다. 5. 치료는 부골 제거술과 유리 근 이식술을 시행하였던 예가 2례, 부골 제거술없이 유리 근 이식술을 시행한 예가 5례였다. 6. 전체 7례 중 6례에서 유리 근 이식술을 시행하였고 1례에서 유리 근피판 이식술을 시행하였는데 복직 근이 4례였고, 광배 피판, 광배 근피판 그리고 박근이 각각 1례씩이었으며 7례 중 6례(85.7%)에서 생존하였다. 7. 대퇴부에 시행하였던 광배 근피판 1례는 정맥이식술을 통한 단측 문합술을 시행하였으나 술 후 2일째부터 허혈성 변화를 일으켜 실패하였으며, 외상으로 인한 종골 1례에서는 복직근 이식술이 성공하였으나, 술 후 심한 외상성 족관절염으로 인한 극심한 통증으로 슬관절 하부 절단술이 시행되었다.